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(NoModeL) N F. B HERZOG.

CIRCUIT GHANGER FOR LATENT SIGNAL TRANSMISSION. V N0.314,294. PatentedMar. 24, 1885."

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NITED F. BENEDIC" HERZOG,

Fries,

on NEW YORK, N. Y.

.srn-errrcArrori forming part of Letters Patent No. 314,294, dated March24, 1885.

Application filed February 10, 185:5. (No model.)

' To all whom it may concern.-

Beit known that I, F. BENEDICT I-Innzoc, a citizen of the United States,residing at New York, in the county and State of New York, have inventeda new and useful Improvement in Circuit-Changers for Latent-SignalTrans- I mission, of which the following is a specification.

In Letters Patent No. 289,83l, issued to me December 11, 1883, I havedescribed an auto matic signaling apparatus applicable to many differentuses, (such as telephone-exchange service, district-telegraph andprivate circuits, hotel-annunciators, &c.,) the main feature of which isthat the apparatus may be properly set by a person desiring to signal toa distant point, and is so constructed that the desired signal is nottransmitted at the moment of setting the instrument, (as is the case ininstruments of the kind known as transmitters i") l but the apparatusretains the signal as .set

until it is released directly or indirectly from a distant point by theperson who is to re ceive the signal at the moment heis readyfor it,when the signal is automatically transmitlhis instrument is capable ofbeing set so as to transmit one and two alterable signals orcombinations of signals,

and enables .the sender to convey to the re eeiver any desiredinformation within the limit of two sets of signals. In this and otherpendparatns, ofthe above character, but which admitof sending any numberof sets or groups of signals instead of only two;

.In other applications'I have shown that it is often desirable that theone who sets the J latent-signal transmitter should-be able to signaltothe office that it is so set and is ready tfobelreleased. I havealsoshown ,that-it is very desirable tobe able, first, to set the in.-,.strumentto, transmit the desired signal, and

2 then, after it isset, ,to indicate this fact to the.

receivingstation; and have I also shown that if means, whereby the actof calling the attenis cation.

tion of the receiving-ofli ce shall not at the same time release, thelatent-signal transmit ter. I have shown several ways in which this canbe done under various conditions-as, for instance, bet-ween two stationsand between a central station and a number of substationsall of whichways, however, have been modifications of my general invention, andhave, moreover, in circuit. 1 The object of this invention is to showhow the receivingstation can be called after the latent-signaltransmitter is set without, by the act of calling, releasing itsretaining mechanism in the general case where there is normally nocurrent in line, and particularly ,where the ordinary magnctogeneratoris used,

as is customary in telephonestations.

In the accompanying drawings I show the necessary mechanism :l'orthispurpose as applied particularly to a form of my latent-sig-- naltransmitter, which I show and make the subject of another applicationfiled December details of the mechanism as are not necessary" to theproper working of this present applifi In the drawings, R represents,generally, a suitable back board; A, an extension-bell in common use intelephone-exchange systems;' 0,- my apparatus as applied to a telephone(where it is used for the purpose of enabling ,a subscriber to set hisinstrument so as to indicate the number of any subscriber in the systemwith whom he wishes to be connected,

so that he can thereupon go about his ordinary business without payingfurther attention to the telephone or speaking with the operator untilthe subscriber whom he has called is at the telephone, or until he hasreceived shown a constant source of current from the central office asignal indicating either that the called subscriber does not respond, orthat the line is busy.)

D represents a magneto to the 2 front of which my apparatus 0 isattached, or with- Ewhich it is incorporated. this isdoneitis-necessary. toprovide. safety V.

chine; I, adisk rigidlylfixedi to the shaft of:

the crank B; K, an insulated metal spring so arranged that it can bepressed upon the anvil O by the disk P when this is pushed in to thebox. Around the shaft of the crank is a spiral spring tending to retractthe crank after it is pushed in.

The current enters by line 1, through binding-post F, to line 2, intothe magneto by post L, through the magneto by J 3 N, into myapparatusthrough the coils of a magnet, as shown, to the frame-work ofthe machine, thence to the arm and contact-spring, as shown, then to theinsulated metal-toothed sector shown out by M 5, intothe bell by H, outby G, and to post E and line 7, as shown.

The method of operation is as follows: After the apparatus has been setas desired it will be necessary to call the attention of some one at theother end. If the crank were turned and the magneto operated, thecurrent therefrom would of course release the apparatus. To prevent thisI arrange my circuits so that the apparatus can be cut out when themagneto or other calling key or device is operated.

Manifestly, the cutting out of the apparatus can be effected either byshunting it or by a direct severing of its circuit-connections at somepoint, and I desire to be understood as including both of thesearrangements under the term cut-out. I 'prefer, however, to provide ashunt instead of severing the circuit, and it is this arrangement whichI have shown in the drawings.

Theshunting operation can be accomplished either manually, or, which ispreferable, automatically. This automatic operation can be brought aboutin many ways, one convenient way applicable Where a crank is used (as inthe present case) to send in a call is represented in the drawings.\Vhen the operator takes hold of the crank to turn it, he at the sametime pushes its shaft in far enough to cause the contacts K O to cometogether. When this takes place, the current upon leaving J will go to3, and instead of going through the resistance of the magnets of mytransmitter and bell will of course take the path of practically noresistanceswitch K, 8, E, and 7. Of course, instead of being shunted, ashere shown, the automatic apparatus might be out out entirely, and thisI do upon certain occasions; but I prefer in general to shunt theapparatus as here shown, as by this means the continuity of the circuitis never broken and the risk of a break in the circuit is thereby Iavoided. Of course it is not necessary that the bell should be separatefrom the magneto, as here shown, it being so shown merely for theconvenience of illustration. In many forms of magneto-bell the ringer isautomatically cutout whenever the generator is being Worked. Inthis formI insert my apparatus in the ringer-circuit, so as to be cut out withit. of the bell will correspond with the signal transmitted; but, whendesirable, this can be avoided and the bell cut out, by means that I donot herein claim, but make the subject of a separate application filedNovember 20, 1884:.

What I claim as of my own invention, and desire to secure by LettersPatent, is

1. The combination, with a single circuit, a latent-signal transmitter,and calling apparatus for informing the receiving-station that thelatent-signal transmitter is set, of a circuit-changer at thetransmitting-station, whereby the call may be operated without therebyreleasing the latent-signal transmitter, substantially as described.

2. The eombinatiomwith a single circuit, a latent-signal transmitter,and calling apparatus for informing the receiving-station that thelatent-signal transmitter is set, of a circuit-changer connected withand operated by the calling apparatus, substantially in the mannerhereinbefore described.

3. The combination, with a single circuit, a latent-signal transmitter,and calling apparatus for informing the receiving-station that thelatent-signal transmitter is set, of a normally-open shunt which whenclosed offers to the current actuating the call-receiving apparatus apath of less resistance Without breaking the continuity of the circuit,and a shuntclosing key whereby the call may be operated without therebyreleasing the latent signal, substantially as described.

4c. The combination, with a single circuit, a latent-signa1 transmitter,and calling apparatus for informing the receiving-station that In thiscase, of course, the taps the latent-signal transmitter is set, of anormally-open shunt which when closed offers to the current actuatingthe call-receiving apparatus a path of less resistance without breakingthe continuity of the circuit, and a shunt-closing key whereby the callmay be operated without thereby releasing the latent transmitter, thesaid key being connected with and operated by the calling apparatus,substantially as described.

5. The combination, in a circuit with normally no current in line, of alatent-signalv Ils automatic shunt-closing key whereby the la tenttransmitter can remain set without being released during the operationof the magneto; substantially as described. v

In testimony whereof I have hereunto set my hand this 10th day ofFebruary, 1885.

F. BENEDICT HERZOG.

Witnesses:

J. WALTER BLAND'FoRn, A. M. TANNER.

